SOUTH LAKE TAHOE, Calif. – High pressure continues to build over the Sierra, creating warm and dry temperatures around Lake Tahoe and triple digits in the valleys. Weekly forecast from NWS Reno:MondaySunny, with a high near 89. TuesdaySunny, with a high near 91. ThursdaySunny, with a high near 89. SundaySunny, with a high near 87.